QuoteRobert Culbertson
6 is a frackin hot plug for anything but an old daily driver. I would suggest bumping to an 8.

The head definitely looks like it has some detonation marks on it.

I actually went down and checked... there's 7's in there now. I remember we switched to 7's after the head gasket blew, thinking that may have been a problem. But maybe go colder yet? worth a try for sure.

That cylinder did get a good wash when the gasket blew... and prior to that the car was running WAY rich (9:1 at full throttle), there's maybe only 30 km's and then 1/2 of Tall Pines running about 12:1 full throttle. The head gasket blew on the Friday night shakedown, then maybe one more pass once repaired, beer, sleep, rally, then boom.

okay, okay... call me stupid. But I got thinking, and working, and well I built something.

So Justy has always had oiling issues. Lots of work had been done to make it as good as possible stock, but that still led to this.

#1 big end just didn't get enough of the juicy stuff...

So after much beer... I took apart and rebuilt these.

Those are 2 Melling 55's, SBC pumps, one regular volume, one high volume. The plan was to run the high volume as a scavange pump, and the regular volume as a pressure pump...

it went through various reiteriations... but ended up mating end to end, as seen here. I used a big piece of plate, and then a whole lot of filing and stuff to get everthing to mate up nicely.

That big bling block of machined al-O-umin-num is a pressure relief valve, made on my drill press... it uses the stock Melling 55 spring and plunger. But the spring is controlled by the bolt at the top, so I can adjust pressure. Yes that's standard copper piping. You'll get a parts $ break down at the end, but I didn't break the $100 mark!

To spin the thing at 1/2 engine RPM, I ran it off the cam... Those are recycled crank to cam pullies and a matching belt.

I took the stock pan, and smashed it with a hammer for a while... I ended up with something like this...

I realized I don't have a great pic of the tank... but I made a tank from some sheet metal, including making my own shrinking hammer to make the tank ends... that's a standard gas pipe cap and bung for a fill. It currently sits in the back of the cabin, behind the passenger seat. flexible copper pipe is used for the plumbing along with standard 1/2" oil cooler hose to connect.

So I fired it up today...

it made 45 lbs on the starter with the plugs pulled.

Then I actually fired it. It shot to 90+ Lbs for a instant, then dropped to 45. i think the shuttle in the relief valve took a second to fill. I shut it down, and turned the pressure up a tad. Idles at 55 lbs.

It's nearly new motor build... so I haven't reved it yet, need to get some other stuff done before I can break in new rings. But, um, I don't think oiling will be a problem from here forward. No leaks from the pump assembly, I made a cork gasket for the pan, dumb, I'm getting some minor leakage there, I'll pull it and permatex it...

QuoteMRWmotorsports
I can't believe your persistence, anyone elsesane person would have pushed the justy off a cliff long ago...
-Martin.

Martin, fixed that for you

A.J. thanks.

We'll see how it holds up. The bracket is big and beefy, the belt is oversized for the load, and the pumps are apparently known to be bomb proof. Spur pumps rather then gear rotors, not as effcient, but robust.

Oil temp sensor in the system... but I figure 10 + feet of copper line should provide a bit of cabin heat If we need more cooling, it will be easy to add in.

I leave for Urr-up in 20 days for a year... so it won't likely see action til next summer... too bad, I wanted to try and run Rallye Saguenay (http://www.couperallye.com/fr/manchettes/item/292-compilation-vid%C3%A9o-rallye-saguenay-2015.html) 2 weeks ago, but too busy getting ready for the move, and too broke...

You dirty bastid. You hain't said a thing! Is did the thanks we get? I slave over a hot keyboard for hours nursing you along and giving you all kinds of silly ideers and you just fawk off on some You're-a-peein vaction for a year..

QuoteMad Matt F
Sponsored ride in Group F... All the training in the Justy paid off, the years of massive wins...

When I return I plan to take over North American rally.

I wish.

No, but it will be fun. Partner's sabbatical year. We'll be in Lausanne (Suisse) for the year. I'll continue stay at home dad status...

What you meant to say is: I'll be just a short little comfy drive from the Vosges, Haute Rhin, Huate Savoie, Savoie, Not far from Ardeche, Haute Alpes, Alpes Maritimes.......
In short the heart of the asphalt rally world...
Where regional rallyes have breathtaking views--sometimes 4050m views straight down

I had a 30 second chance to play with Monster Justy today... As of last running situation, it made great steady oil pressure at idle, 60 lbs... controlled by my clever adjustable bypass valve, or so I thought.

I seemed to be able to adjust it, however off idle things got "weird" as RPM increased oil pressure went DOWN ???? from 60 at idle to 30 at 5000... ?????? WTF?

So I thought, "oh the suction from the pressure pump is holding the relief valve open. And maybe even sucking it dry at high revs"

So today I pulled the relief off, and set it up to dump into the valve cover. Absolutely nothing out of the relief valve, and...

SAME THING.

I get high idle oil pressure and a drop at rpm. WTF????

I've attached this mess of a pic to try and illustrate the plumbing.

I built the oil relief, but I used the components and dimensions from the stock Melling relief valve.

Caveat, I climb trees... I'm not an engineer. ( I do have a graduate degree in some sort of tree biomechanics junk, but that accounts for nothing in this case) So I'm probably an idiot, and have missed something big.

I'm no hydraulicist but I'd think it should be -12 minimum, maybe -16, given that -10 works real good on the pressure side and you really REALLY don't want pressure drop on the inlet.

Also, I need to make a meme jpeg of that one image. "This is a dry sumped Justy engine in the back of an MGB-GT. Your argument is invalid"

-12? 1/2 inch for the win mang...

Pete, I lurv ya...

Let me correct,

"this here is a garage built, triple carb fed, high compression, over cammed, dry sumped Justy engine with 100K kms on it, in the back of a bone stock MGB-GT. If you think your idea is stupid, your argument is invalid"

Is your tank vented? Is it below or above the pump? Seems to me you have to either be restricted on suction or not enough return flow from the top end. Or depending on the tank vent possibly just seeing the effect of closed loop and actually have plenty of oil flow. If it were hydraulic lifters you would hear that drop turn into noise pretty fast.

For reference, SBC pumps in their native habitat, meaning the pressure relief dumps to the pump inlet thus reducing the amount of oil going through the pickup, used to have a 5/8" inlet pipe but this was changed to 3/4" sometime in the 90s.

I'm not saying 1/2" is your current problem but it might become one...